ATS672LSB Datasheet, PDF (1/12 Pages) Allegro MicroSystems – Self-Calibrating TPO Gear-Tooth Sensor with 9-Bit Signal Capture

ATS672LSB
Preliminary – Subject to Change
PIN OUT DIAGRAM
4321
Pin 1: V_CC
Pin 2: V_OUT
Pin 3: Test Pin (Tie to GND)
Pin 4: Gnd
ABSOLUTE MAXIMUM RATINGS
Supply Voltage,
V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . 28 V
Reverse Supply Voltage,
V_R . . . . . . . . . . . . . . . . . . . . . . . . . . . . –18 V
Reverse Current Through Output,
I_R . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA
Continuous Output Current,
I_OUT . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Storage Temperature,
T_S . . . . . . . . . . . . . . . . . . . . . . . . . . . 170° C
Package Power Rating,
R_θJA. . . . . . . . . . . . . . . . . . . ~150°C/W
Maximum Junction Temperature,
T_Jmax . . . . . . . . . . . . . . . . . . . . . . . . . 170° C
Maximum Junction Temperature – 100 Hours,
T_Jmax . . . . . . . . . . . . . . . . . . . . . . . . . 180° C
Self-Calibrating TPO Gear-Tooth Sensor with
9-Bit Signal Capture
The ATS672LSB true zero-speed gear-tooth sensors are
optimized Hall IC/magnet configurations packaged in a single in-
line package (SIP) that provides a user-friendly solution for digital
gear-tooth-sensing applications. The SIP module consists of an
over-molded package, which holds together a samarium cobalt
magnet, a pole piece and a true zero-speed Hall IC that has been
optimized to the magnetic circuit. This small package can be
easily assembled and used in conjunction with gears of various
shapes and sizes.
The sensor incorporates a single-element Hall IC that switches
in response to magnetic signals created by a ferrous target. The
IC contains a sophisticated digital circuit designed to eliminate the
detrimental effects of magnet and system offsets. Signal
processing is used to provide zero-speed performance
independent of air gap and also to dynamically adapt device
performance to the typical operating conditions found in
automotive applications (reduced vibration sensitivity). High-
resolution (9-bit) peak-detecting DACs are used to set the adaptive
switching thresholds of the device. Hysteresis in the thresholds
reduces the negative effects of any anomalies in the magnetic
signal (such as magnetic overshoot).
The ATS672LSB also includes a low-bandwidth filter that
increases the noise immunity and the signal-to-noise ratio of the
sensor. These features result in potential improvements in both
the timing accuracy and the jitter performance of the device. The
ATS672LSB sensor system is optimized for cam applications.
Four versions of this device are available. The sensor can be
chosen to have a high or low output signal in response to a “tooth”.
The sensor is also available with and without TPOS (true power on
state) capability. The low-on-tooth sensor without TPOS is
available through general sales. (Part # ATS672LSB-LN). For
other versions please contact the factory. Some restrictions may
apply.
FEATURES
ΠTight timing accuracy over temperature
ΠTrue zero-speed operation
ΠTrue power-on sensing
ΠAir gap independent switch points
ΠHigh vibration immunity
ΠLarge operating air gaps
ΠOperation down to 3.3 V
ΠDigital output representing target profile
ΠSingle-chip solution for high reliability
ΠSmall mechanical size
ΠOptimized Hall IC magnetic system
ΠAGC and reference-adjust circuit
ΠUndervoltage lockout